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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost $ 7,173,235 $ 7,152,127
Amortized Cost or Cost, Equity securities 143,203 134,013
Unrealized Investment Gains 392,286 374,991
Unrealized Investment Losses 54,771 70,410
Fair Value and Fair Value, Equity 7,510,750 7,456,708
Investment Fair Value, Equity securities 156,975 141,649
OTTI in AOCI [1] 1,538 1,618
Mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost [2] 581,346 587,355
Unrealized Investment Gains [2] 33,904 34,256
Unrealized Investment Losses [2] 5,443 6,720
Fair Value and Fair Value, Equity [2] 609,807 614,891
OTTI in AOCI [1],[2] 0 0
Other, including U.S. Treasury Securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost [2] 520,718 458,745
Unrealized Investment Gains [2] 19,809 18,518
Unrealized Investment Losses [2] 9,219 10,120
Fair Value and Fair Value, Equity [2] 531,308 467,143
OTTI in AOCI [1],[2] 0 0
Municipal bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost 1,647,314 1,648,252
Unrealized Investment Gains 148,319 143,733
Unrealized Investment Losses 18,206 22,588
Fair Value and Fair Value, Equity 1,777,427 1,769,397
OTTI in AOCI [1] 0 0
Foreign government bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost 93,845 93,864
Unrealized Investment Gains 5,897 5,102
Unrealized Investment Losses 56 297
Fair Value and Fair Value, Equity 99,686 98,669
OTTI in AOCI [1] 0 0
Corporate bonds [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost 2,683,746 2,672,818
Unrealized Investment Gains 162,602 152,229
Unrealized Investment Losses 9,175 14,826
Fair Value and Fair Value, Equity 2,837,173 2,810,221
OTTI in AOCI [1] 0 0
Other mortgage-backed securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost 1,646,266 1,691,093
Unrealized Investment Gains 21,755 21,153
Unrealized Investment Losses 12,672 15,859
Fair Value and Fair Value, Equity 1,655,349 1,696,387
OTTI in AOCI [1] 1,538 1,618
Equity securities [Member]    
Unrealized gains and losses on fixed maturities and equity securities    
Amortized Cost or Cost, Equity securities [3] 143,203 134,013
Unrealized Investment Gains [3] 15,743 13,210
Unrealized Investment Losses [3] 1,971 5,574
Investment Fair Value, Equity securities [3] 156,975 141,649
OTTI in AOCI [1],[3] $ 0 $ 0
[1] Related to securities for which an unrealized loss was bifurcated to distinguish the credit-related portion and the portion driven by other market factors. Represents the amount of OTTI losses in AOCI which was not included in earnings; amounts also include net unrealized investment gains and losses on such impaired securities relating to changes in the fair value of those securities subsequent to the impairment measurement date.
[2] Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $283,039 and $272,668; Federal Home Loan Mortgage Corporation (“FHLMC”) of $373,017 and $378,683; and Government National Mortgage Association (“GNMA”) of $112,065 and $115,627 as of March 31, 2017 and December 31, 2016, respectively.
[3] Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.